Wealthy nations have ordered millions of doses of unproven candidates, but equal access is the key to beating virus
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The UK has ordered a total of 340m doses of potential coronavirus vaccines from six manufacturers.
The EU has done a deal said to be worth €2.4bn (£2.2bn) with one developer, while the US has orders with six companies for 800m doses under Operation Warp Speed, with options on a further 1.6bn.
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